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2005年04月25日

【期刊论文】Comparative Study of KTiOPO4 crystals

胡小波， X.B. Hu a， *， H. Liu a， J.Y. Wang a， H.J. Zhang a， H.D. Jiang a， S.S. Jiang b， Q. Li b， Y.L. Tian c， Y.Y. Huang c， W.X. Huang c， W. He c

Optical Materials 23(2003)369-372，-0001，（）：

-1年11月30日

摘要

High purity KTiOPO4 (KTP) crystals have been grown using a ﬂux method. The quality, SHG e ciency and damage threshold of KTP crystals grown from high purity reagents were compared with those grown from commercial reagents. Experimental results indicate that KTP crystals using a high purity charge contain less impurities and possess higher SHG eﬃciency and damage threshold than do crystals grown from commercial reagents. It is proposed that decreasing the concentrations of impurities is an effective way of raising the damage threshold for KTP crystals.

KTiOPO4， SHG， Damage threshold， Crystal growth

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2005年04月25日

【期刊论文】Raman study of phonons in K2Al2B2O7 crystals

胡小波， X. B. Hu a J. Y. Wang， C. Q. Zhang， and X. G. Xu

Appl. Phys. Lett., Vol. 85, No.12, 20 September 2004，-0001，（）：

-1年11月30日

摘要

A Raman scattering study of the vibrational modes in K2Al2B2O7 crystals has been performed at room temperature. The vibrational modes are classified by the nuclear site group analysis method and the internal vibrational modes are assigned to vibrations of the BO3 triangle and AlO4 tetrahedron.

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2005年04月25日

【期刊论文】Image shifts resulting from the misorientation of two individuals in GdCa4O (BO3) 3 crystal

胡小波， Xiaobo Hu a， b， *， Jiyang Wang b， Shusheng Jiang a， Hong Liu b， Ming Guo b， Huaidong Jiang b， Chengqian Zhang b， Yulian Tian c， Wanxia Huang c

Journal of Crystal Growth 229(2001)252-255，-0001，（）：

-1年11月30日

摘要

Large GdCa4O (BO3) 3 crystal has been grown by the Czochralski method. The quality of GdCa4O (BO3) 3 crystal was assessed by white-beam synchrotron radiation topography. It has been found that there is a sub-grain boundary in the GdCa4O (BO3) 3 crystal. The boundary divides the large GdCa4O (BO3) 3 crystal into two individuals. Due to the misorientation between the two individuals, the image shifts can be observed in the synchrotron topographs. Based on the misorientation determined by high resolution X-ray diﬀractometer, the image shifts were calculated for several reﬂections. The calculations are in agreement with the measurements from the topographs very well. In addition, the formation mechanism of sub-grain boundary is discussed.

X-ray diffraction， A1.， X-ray topography， B1.， Gadolinium compounds

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2005年04月25日

【期刊论文】Priority communication Observation of inhomogeneity in congruent LiTaO3 crystal

胡小波， X.B. Hu a， b， *， H.D. Jiang b， H. Liu b， S.S. Jiang a， Q. Lia， J.Y. Wang b， C.Q. Zhang b， B. Teng b， Y.L. Tian b， W.X. Huang c

Journal of Crystal Growth 225(2001)6-8，-0001，（）：

-1年11月30日

摘要

The inhomogeneity in a congruent LiTaO3 crystal has been observed by transmission synchrotron topography. Many extraordinary regions exist in congruent LiTaO3 crystal and they often show diffraction intensity different from that of ordinary regions in synchrotron topographs. Differential thermal analysis indicates that the Curie temperature of the extraordinary region is lower than that of ordinary region, and the extraordinary region is really a high defect density region. The diffraction contrast of the extraordinary region in synchrotron topographs is explained qualitatively by a calculation at the selected wavelength.

X-ray topography， B1.， Lithium compounds

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2005年04月25日

【期刊论文】Growth Twinning in Self-Frequency-Doubling Laser Crystal NdxGd1 xAl3 (BO3) 4 Observed with White-Beam Synchrotron Radiation Topography

胡小波， X. B. Hu (a)， J. Y. Wang (a)， L. L. Tian (a)， Q. C. Guan (a)， Y. G. Liu (a)， J. Q. Wei (a)， M. H. Jiang (a)， W. J. Liu (b)， S. S. Jiang (b)， and J. H. Jiang (c)

phys. stat. sol. (a) 170, 29 (1998)，-0001，（）：

-1年11月30日

摘要

The growth twinning in self-frequency-doubling laser crystal NdxGd1 xAl3 (BO3) 4 (NGAB) has been observed with white-beam synchrotron radiation topography (WBSRT). It is shown that the growth twinning in flux-grown NGAB crystal is the 180 rotation twin in which the twofold symmetric operation axis is parallel to the [0001] direction and this kind of twinning often shows the black-and-white contrast in X-ray topography. It is believed that the growth twinning in NGAB was induced by growth bands formed during crystal growth.

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